Exhaust gas purification system for a diesel engine

Details Exhaust gas purification system for a diesel engine Exhaust gas purification system for a diesel engine

1991-12-18

1993-05-18

Lazarus, Ira S.

Power plants

Internal combustion engine with treatment or handling of...

Having auxiliary device mechanically driven by exhaust gas

60277, 60285, 60301, 60284, 60286, F01N 302, F01N 322

Patent

active

052110109

ABSTRACT:
An exhaust gas purification system for a diesel engine 2 with a lean NOx catalyst 4 includes a temperature detecting means 6, an excess air ratio changing means 8 capable of changing an excess air ratio without changing a fuel injection amount, a control means for controlling the excess air ratio changing means 8 so as to increase the excess air ratio when the exhaust gas temperature is higher than an upper limit of a predetermined temperature range and to decrease the excess air ratio when the exhaust gas temperature is lower than a lower limit of a predetermined temperature range. In the exhaust gas purification system, the exhaust gas temperature can be controlled to the temperature range independently of the fuel injection amount.

REFERENCES:
patent: 4233811 (1980-11-01), Masaki et al.
patent: 4404804 (1983-09-01), Tadokora et al.
patent: 4471611 (1984-09-01), Watanabe
patent: 4934142 (1990-06-01), Hayashi et al.
patent: 5021227 (1991-06-01), Kobayashi et al.
patent: 5041270 (1991-08-01), Fujitani et al.

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